feat: add branch protection workflow for main branch

Author: Jakee4488

.github/workflows/protect_main.yml

@@ -78,75 +78,3 @@ jobs:
           echo "   Base  : ${{ github.event.pull_request.base.ref }}"
           echo "   Head  : ${{ github.event.pull_request.head.ref }}"
 
-  # ──────────────────────────────────────────────────────────────
-  # JOB 3: Enforce branch naming convention on PR
-  # ──────────────────────────────────────────────────────────────
-  branch-name-check:
-    name: Enforce Branch Naming Convention
-    runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request'
-    steps:
-      - name: Check branch name
-        run: |
-          BRANCH="${{ github.event.pull_request.head.ref }}"
-          echo "Branch name: $BRANCH"
-
-          # Allowed patterns:
-          #   feature/*       (new features)
-          #   fix/*           (bug fixes)
-          #   hotfix/*        (emergency production fixes)
-          #   chore/*         (maintenance, deps, docs)
-          #   refactor/*      (code improvements)
-          #   release/*       (release candidates)
-          if echo "$BRANCH" | grep -qE '^(feature|fix|hotfix|chore|refactor|release)/.+'; then
-            echo "✅ Branch name '$BRANCH' follows naming convention"
-          else
-            echo "=========================================="
-            echo "❌ Invalid branch name: '$BRANCH'"
-            echo "=========================================="
-            echo ""
-            echo "Branch names must follow the pattern:"
-            echo "  feature/<description>   — new functionality"
-            echo "  fix/<description>       — bug fixes"
-            echo "  hotfix/<description>    — emergency production fixes"
-            echo "  chore/<description>     — maintenance tasks"
-            echo "  refactor/<description>  — code improvements"
-            echo "  release/<version>       — release candidates"
-            echo ""
-            echo "Examples:"
-            echo "  feature/add-xgboost-model"
-            echo "  fix/drift-psi-threshold"
-            echo "  chore/update-dependencies"
-            echo "=========================================="
-            exit 1
-          fi
-
-  # ──────────────────────────────────────────────────────────────------
-  # JOB 4: Verify PR has a meaningful description
-  # ──────────────────────────────────────────────────────────────-------
-  pr-description-check:
-    name: PR Description Required
-    runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request'
-    steps:
-      - name: Check PR body length
-        run: |
-          BODY_LENGTH=$(echo "${{ github.event.pull_request.body }}" | wc -c)
-          echo "PR description length: $BODY_LENGTH characters"
-
-          if [ "$BODY_LENGTH" -lt 30 ]; then
-            echo "=========================================="
-            echo "❌ PR description is too short ($BODY_LENGTH chars)"
-            echo "=========================================="
-            echo ""
-            echo "Please add a meaningful PR description that includes:"
-            echo "  - What changed and why"
-            echo "  - How to test the changes"
-            echo "  - Any breaking changes or deployment notes"
-            echo "=========================================="
-            exit 1
-          else
-            echo "✅ PR description looks good ($BODY_LENGTH chars)"
-          fi
-
-